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1. Find absolute max and min of     f(x,y)= x^2- xy + y^2 +1 on the closed...

1. Find absolute max and min of     f(x,y)= x^2- xy + y^2 +1 on the closed triangular plate in the first quadrant x=0, y=4, y=x

2. Given position of a particle by π (t)= Cos2ti + 3 sin2ti,         Find the particle velocity and acceleration at t=0

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